On the authority of Abdullaah bin ‘Amr who said: Someone asked :

O Messenger of Allaah! Who are the best of the people?’

He answered: ‘Everyone who has a mahkmoom heart and a truthful tongue.’

They asked: ‘We know what a truthful tongue is, but what is a mahkmoom heart?’

He said: ‘A pious, pure one, which has no sin in it nor is it oppressive, nor does it have hatred and jealousy.’

Silsilah Ahadeeth As-Saheehah of Shaykh Al-Albaani – No.948

Source : Some Ahadeeth pertaining to Manners, Righteousness & Keeping Good Relations – 01 | 02 | 03 | 04 | 05 | 06| 07 | 08 – Taken from Silsilah Ahadeeth As-Saheehah of Shaykh Al-Albaani – Translated by Abbas Abu Yahya